To Ride, Shoot Strait, and Speak the Truth, Jeff Cooper, "Principles of Pistol Sighting"
Non-telescopic rifle sights may be set far enough apart so that front and rear lie at significantly different distances from the eye. The farther they lie apart - the greater the "sight radius" - the more precise may be the alignment they afford. However, the greather the sight radius the less it becomes possible to focus on both sights at once. Therefore the aperture rifle sight is better than the open rifle sight since the latter requires a short radius, with the notch set well forward on the barrel, while the former allows the ring to be set close to the eye, to be looked through rather then at. With a well-designed aperture rifle sight - large diameter, thin rim - you may disregard the rear sight as long as you are looking through it.
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